RFR: 8374349: [VectorAPI]: AArch64: Prefer merging mode SVE CPY instruction [v4]

[Andrew Haley]

On Thu, 26 Feb 2026 01:59:19 GMT, Eric Fang <erfang at openjdk.org> wrote:

>>> Hi [@theRealAph](https://github.com/theRealAph) , it's a private method,
>> 
>> It isn't. The `public:` declaration is right there.
>
> We have two public methods to copy an integer/floating-point immediate to vector elements:
> ```  
> void sve_cpy(FloatRegister Zd, SIMD_RegVariant T, PRegister Pg, int imm8, bool isMerge) {...}
> void sve_cpy(FloatRegister Zd, SIMD_RegVariant T, PRegister Pg, double d) {...}
> 
> Both of them call the private method `_sve_cpy` (before the renaming, it's `sve_cpy`).
> 
> void _sve_cpy(FloatRegister Zd, SIMD_RegVariant T, PRegister Pg, int imm8, bool isMerge, bool isFloat) {
> 
> The parameters of the public versions and the private version are different.
> 
> Please correct me if I misunderstood your meaning, thanks~

Ah, I see. That's OK, sorry.

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PR Review Comment: https://git.openjdk.org/jdk/pull/29359#discussion_r2858236552